A woman in Prince Edward Island, Canada finds fossilized footprints of a creature that lived 100 million years before the first dinosaurs.
The woman, who has a background in geology found them in a piece of rock last may.
The footprints are from a dimetrodon, a huge reptile-like mammal.
Fossils from them have been found on Prince Edward Island before.
In 1845, a farmer found part of a jaw from one of these creatures during an excavation.
